Storage method for gamma value look-up table

Abstract

A storage method for a gamma value look-up table comprises storing gamma values corresponding to grays exceeding or equaling a 33rd gray in the gamma value look-up table, and calculating gamma values corresponding to a 1st gray to a 32nd gray by a formula.

1. A method for a gamma value look-up table in a memory of an electronic device, comprising:
 storing gamma values corresponding to grays exceeding or equaling a 33rd gray in the gamma value look-up table of the electronic device; and 
 calculating gamma values corresponding to a 1st gray to a 32nd gray by a formula, 
 wherein the gamma values corresponding to the 1st gray to the 32nd gray are expressed as the formula: 
 
       
         
           
             
               
                 
                   gamma 
                   ⁡ 
                   
                     ( 
                     i 
                     ) 
                   
                 
                 = 
                 
                   
                     
                       gamma 
                       ⁡ 
                       
                         ( 
                         256 
                         ) 
                       
                     
                     × 
                     
                       
                         ( 
                         
                           i 
                           256 
                         
                         ) 
                       
                       γ 
                     
                   
                   + 
                   
                     
                       ( 
                       
                         
                           
                             gamma 
                             ⁡ 
                             
                               ( 
                               33 
                               ) 
                             
                           
                           - 
                           
                             
                               gamma 
                               ⁡ 
                               
                                 ( 
                                 256 
                                 ) 
                               
                             
                             × 
                             
                               
                                 ( 
                                 
                                   32 
                                   256 
                                 
                                 ) 
                               
                               γ 
                             
                           
                         
                         32 
                       
                       ) 
                     
                     × 
                     i 
                   
                 
               
               , 
             
           
         
       
       where, i denotes a gray, i exceeds or equals 1 and is less than or equal to 32, gamma(i) denotes a gamma value corresponding to an ith gray, gamma(256) denotes a gamma value corresponding to the 256th gray, gamma(33) denotes a gamma value corresponding to the 33rd gray, and γ denotes a parameter exceeding or equaling 1.8 and less than or equal to 2.4. 
     
     
       2. The method of  claim 1 , wherein the number of grays is 256. 
     
     
       3. The method of  claim 1 , wherein the parameter γ is 2.2. 
     
     
       4. The method of  claim 3 , wherein each gamma value corresponding to the 33rd gray to the 256th gray is stored in a 10 bit form. 
     
     
       5. The method of  claim 4 , wherein gamma values corresponding to the 33rd gray, a 34th gray, a 35th gray and a 36th gray are stored in bytes corresponding to addresses from 0 to 4. 
     
     
       6. The method of  claim 5 , further comprising:
 storing the lower 8 bits of a gamma value corresponding to a 33rd gray in bit 0  to bit 7  of a byte corresponding to an address which is 0; 
 storing the higher 2 bits of the gamma value corresponding to the 33rd gray in bit 0  to bit 1  of a byte corresponding to an address which is 4 respectively; 
 storing the lower 8 bits of a gamma value corresponding to a 34th gray in bit 0  to bit 7  of a byte corresponding to an address which is 1; 
 storing the higher 2 bits of the gamma value corresponding to the 34th gray in bit 2  to bit 3  of a byte corresponding to an address which is 4 respectively; 
 storing the lower 8 bits of a gamma value corresponding to a 35th gray in bit 0  to bit 7  of a byte corresponding to an address which is 2; 
 storing the higher 2 bits of the gamma value corresponding to the 35th gray in bit 4  to bit 5  of a byte corresponding to an address which is 4 respectively; 
 storing the lower 8 bits of a gamma value corresponding to a 36th gray in bit 0  to bit 7  of a byte corresponding to an address which is 3; 
 storing the higher 2 bits of the gamma value corresponding to the 36th gray in bit 6  to bit 7  of a byte corresponding to an address which is 4 respectively.